BioMedical Admissions Test (BMAT) Practice Test 2025 - Free BMAT Practice Questions and Study Guide

During the electrolysis of copper, the anode plays a critical role in the process of converting electrical energy into chemical energy. In this context, the anode is typically made of impure copper, and as the electrolysis proceeds, oxidation occurs at the anode. This means that copper atoms in the anode lose electrons and dissolve into the electrolyte as copper ions. This process results in the anode gradually losing mass as it releases copper ions into the solution, which then migrate to the cathode where they can be plated out as pure copper.

This understanding highlights that the anode indeed dissolves as copper ions are released into the electrolyte solution during the electrolysis process. The option stating that it dissolves accurately reflects this chemical reaction occurring at the anode, making it the correct choice. The changes occurring in the anode are essential for driving the process of electrolysis, allowing the deposition of copper at the cathode while the anode provides a source of those copper ions.